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In the past (pve3) we had similar. I don't really know why... we changed on the advice of the PVE support to a seperatly vlan only for the clustercommunication, and yes we have done not only vlan, also a physical extra nic bonding for the clustercommunication. After that we never hat such problems. Maybe it is a little bit sensitive.

But this was on version 3.x. On version 4.x we haven't tested without extra vlan. Every cluster has his one phy and vlan for the communication.

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